High-speed telegraphic system



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HIGH-SPEED TELEGRAPHIC SYSTEM Original Filed Oct. 25,.1945 19 Sheets-Sheet 12 o t l L' 0 FIS 15b. EA I o L! t Y :Y 5 l l I LI-"LJ- Sp 8p' Sp" VO LTAG E G. VALENSI HIGH-SPEED TELEGRAPI-IIC SYSTEM Dec. 2, 1952 Original Filed Oct. 23, 1945 19 Sheets-Sheet 15 Dec. 2, 1952 G. vALENsl SPEED TEEEGEAPHIC SYSTEM HIGH- Orginal Filed Oct. 23, 1945 19 Sheets-Sheet 14 An A Dec. 2, 1952 G. vALENsl HIGH-SPEED TELEGRAPHIC SYSTEM Original Filed Oct. 23, 1945 19 Sheets-Sheet 15 HHHH'Q l l. l Il PVR w b 111111111 if Q nx rraRA/fy Dec. 2, 1952 G. vALENsl HIGH-SPEED TELERAPHIc SYSTEM 19 Sheets-Sheet 16 Original Filed Oct. 23, 1945 ,QrrdE/vey Dec. 2, 1952 G. vALENsl 2,620,394

HIGH-SPEED TELEGRAPHIC SYSTEM Original Filed Oct. 23, 1945 19 Sheets-Sheet 17 G. VALENSI SPEED TELEGRAPHIC SYSTEM Dec. 2, 1952 HIGH- 19 Sheets-Sheet 18 Original Filed 001.. 23, 1945 Dec. Z, 1952 G. vALENsl HIGH-SPEED TELEGRAPHIC SYSTEM 19 Sheets-Sheet 19 Original Filed Oct. 25, 1945 se: bun-0^ Patented Dec. 2, 1952 UNirD Continuation of application Serial No. 623,941, October 23, 1945. This application March 3,

1950, Serial No. 147,463.

In France April 17,

Section 1, Public Law 690, August 8, 1946 Patent expires April 17, 1963 7 Claims.

This invention relates to high speed telegraphic system and apparatus therefor and has as one object the provision of high speed telegraphy system characterised by the fact that it includes: a preliminary recording of the telegraphic signals in a manner which is independent of the rhythm or timing of their subsequent transmission, a high speed transmission of the recorded signals over a telephonie channel and their reception and subsequent recording upon photographic :film by means of an electro-optical relay synchronised by the manner of transmission. Other important features of the system will become apparent in the course of the description of various embodiments which is given hereafter.

The present invention has for a further obiect the provision of telegraphic apparatus permitting the practical application of the above described system.

The present application is a continuation of L the application Serial No. 623,941 led October 23, 1945, and now abandoned.

According to a preferred form of the invention, the apparatus is accorded a non-rhythmic or start-stop transmission with the aid of a keyboard similar to that of a typewriter, by making a preliminary recording of the required telegraph signals upon a magnetic ribbon and then effecting a synchronised automatic transmission and reception of said signals, the final recording being made upon photographic films with the facility for visual control if required. There is used at the receiving station an electro-optical relay which is, preferably, a cathode-iagy oseillograph (with either fluorescent or phosphorescent screen), but which may be any other form of electro-optical relay as, for instance, a tube used for television reception purposes.

Such a telegraphic apparatus combines the advantages of the non-rhythmic manipulation of an ordinary keyboard by a conventional typewriter, and of a high eiciency from the point of view of telegraph traiiic; in particular this apparatus permits the complete utilisation of the effective frequency band capable of being transmitted by a telephone channel having a highfrequency carrier current of a modern multiplex telephony system having coaxial cable circuits` Furthermore, such apparatus is instantaneously adaptable to any language, and is particularly suitable for eiecting telegraph transmission with secrecy.

Although the nal reception is photographic, the possibility of effecting a visual control (either preliminarily or somultaneously) allows, in the particular case where a radio transmission channel affected by troublesome parasitics is used. the receiving operator to ask the transmitting operator to repass two or three times, one after the other, the magnetic ribbon upon which the telegram has been recorded, before erasing the recording on the ribbon; since the parasitics have a fortuitous character, such repetition permits the complete reconstitution of the telegram at the receiving station in spite of the radio parasitics.

`In the telegraphic code, used in this invention. to each character (letter, iigure or punctuation mark) there is assigned a combination of two signals; a preliminary signal and a code signal, which is itself a single impulse of a predetermined duration, which latter is the same for all characters, each character (letter or figure) being characterized either by the time interval which passes between the end of the preliminary signal and the commencement of said impulse or code signal, or by the amplitude of said impulse or code signal.

The magnetic ribbon upon which the signals are recorded is set in motion and arrested automatically for each character during the manipulation of the keyboard by the typewriter concerned with the recording of the telegrams. The preliminary signal, transmitted regularly, serves to synchronize the scanning of the luminous surface of the electro-optical relay at the receiving station (e. g. the fluorescent or phosphorescent screen of a receiving cathode-ray oscillograph). Further when one desires to receive by page and not by strip, the typewriter at the transmitting station, after each group of 52 characters (letters or figures with the appropriate included spaces), constituting one line of the text to be transmitted, operates several times in succession a key marked return in a manner to record on the magnetic ribbon a return signal which, at the receiving station serves to bring backl the scanning spot from the end of the beginning of its trajectory over the said luminous surface. The preliminary signal and the return signal serve as synchronising signals like the "line and the frame synchronising signals respectively, in television; such synchronising signals differ from the code signals preferably by their polarity (and in this case, the preliminary signal is itself distinguished from the return signal by its duration): but the synchronisation signals may also be differentiated from the code signals by the frequency of a carrier wave (and in that case, the preliminary'signal may be dif- 

